[serializer/debugger] hide scripts in the snapshot from the debugger.

test/cctest/test-serialize.cc

 // Copyright 2007-2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 620 matching lines @@
   {
     v8::Isolate::Scope i_scope(isolate1);
     v8::HandleScope h_scope(isolate1);
     v8::Local<v8::Context> context = v8::Context::New(isolate1);
     delete[] data1.data;  // We can dispose of the snapshot blob now.
     v8::Context::Scope c_scope(context);
     v8::Maybe<int32_t> result =
         CompileRun("f()")->Int32Value(isolate1->GetCurrentContext());
     CHECK_EQ(42, result.FromJust());
     CHECK(CompileRun("this.g")->IsUndefined());
+    v8::Local<v8::Value> f = CompileRun("f");
+    i::Handle<i::JSFunction> function =
+        i::Handle<i::JSFunction>::cast(v8::Utils::OpenHandle(*f));
+    // Being part of the snapshot hides a script from the debugger.
+    CHECK(!function->shared()->IsSubjectToDebugging());
   }
   isolate1->Dispose();
 }
 
 TEST(CustomSnapshotDataBlob2) {
   DisableAlwaysOpt();
   const char* source2 =
       "function f() { return g() * 2; }"
       "function g() { return 43; }"
       "/./.test('a')";
@@ skipping 1814 matching lines @@
   }
   delete[] blob.data;
 }
 
 TEST(SerializationMemoryStats) {
   FLAG_profile_deserialization = true;
   FLAG_always_opt = false;
   v8::StartupData blob = v8::V8::CreateSnapshotDataBlob();
   delete[] blob.data;
 }